CN112921502A

CN112921502A - Antibacterial and antiviral melt-blown fabric and preparation method thereof

Info

Publication number: CN112921502A
Application number: CN202110093941.4A
Authority: CN
Inventors: 程杰; 王超威; 闫立论; 王薇; 崔景强; 夏怡琳; 胡趁趁; 李菲; 蒋飞远; 李丹杰; 王国锋; 刘志远; 刘改杰
Original assignee: Henan Camel Medical Device Research Institute Co ltd
Current assignee: Henan Camel Medical Device Research Institute Co ltd
Priority date: 2021-01-22
Filing date: 2021-01-22
Publication date: 2021-06-08

Abstract

The invention relates to an antibacterial and antiviral melt-blown fabric and a preparation method thereof, wherein the antibacterial and antiviral melt-blown fabric is prepared from the following raw materials in parts by weight: 100 parts of polypropylene particles with the melt index of 1500, 1-5 parts of electret master batches, 0.03-10 parts of antibacterial and antiviral agents, 0.1-2 parts of lubricating agents, 0.2-2 parts of dispersing agents and 0.1-0.2 part of heat stabilizers. The preparation method of the melt-blown fabric comprises the following steps: pretreating the antibacterial and antiviral agent in the step (1), mixing the raw materials in the step (2), melt-blowing in the step (3), and testing the physical properties in the step (4). By adding the lubricant, the dispersant and the heat stabilizer, the antibacterial and antiviral agent is uniformly dispersed in the polypropylene particles, so that the thermal stability and the dispersibility of the antibacterial and antiviral agent are improved, the antibacterial and antiviral agent is not decomposed in the processing and using processes, the antibacterial and antiviral agent has excellent antibacterial and antiviral effects and high biological safety performance, and a preparation process of direct melt-blow molding is adopted, so that the operation process is simplified, the production cost is reduced, and the antibacterial and antiviral agent is suitable for large-scale production.

Description

Antibacterial and antiviral melt-blown fabric and preparation method thereof

Technical Field

The invention belongs to the technical field of melt-blown fabric production and preparation, and particularly relates to an antibacterial and antiviral melt-blown fabric and a preparation method thereof.

Background

The melt-blown cloth is a filter material taking polypropylene as a main raw material, the fiber diameter of the filter material can reach 0.5-10 microns, and the superfine fibers with unique capillary structures increase the number and the surface area of fibers in unit area, so that the melt-blown cloth has good filtering property, shielding property, heat insulation property and oil absorption property, and can be used in the fields of air, liquid filter materials, isolating materials, absorbing materials, mask materials, heat-insulating materials, wiping cloth and the like. The melt-blown cloth is the most central material of the mask, and can capture droplets containing bacteria and viruses through various mechanisms such as interception, electrostatic attraction and the like.

At present, the effective live time of using the most extensive disposable gauze mask in the market is 4 hours, and the longest is no longer than 8 hours, during the use, leads to the gauze mask internal surface easily by the humid and hot gas of human exhalation to breed the bacterium, can be inhaled by people's secondary, plays fine guard action, and can not reuse, because make used gauze mask surface adhesion have a large amount of bacterium, virus, after using to finish abandoning, still can cause environmental pollution.

In response to the above problems, researchers have conducted a number of research experiments. CN202010421310.6 discloses a method for manufacturing a novel antimicrobial environment-friendly mask, which is characterized in that quaternary ammonium salinized chitin and polylactic acid are compounded, a nanofiber membrane is prepared through electrostatic spinning, and the nanofiber membrane is tightly coated on the surface of quaternary ammonium salinized chitin non-woven fabric to play the roles of antibiosis and hydrophobicity. The technology adopts the electrostatic spinning method to prepare the filtering material, compared with the conventional melt-blown method, the production efficiency is low, the cost is too high, the large-area popularization and application are not facilitated, the antibacterial material is attached to the surface of the non-woven fabric, the fiber diameter of the non-woven fabric is relatively thick and is about 20 mu m, the supporting effect is mainly achieved, the bacteria and the viruses are not greatly blocked, and the bacteria and the viruses can easily penetrate through the non-woven fabric. As is known, the antibacterial agent can only contact with viruses and bacteria sufficiently to kill the viruses and bacteria, and the non-woven fabric cannot block the viruses and the bacteria, so that the antibacterial effect is not obvious.

CN202010128690.4 discloses a preparation method of an antibacterial and antiviral non-woven fabric, which combines a metal ion antibacterial technology, an organic matter antibacterial technology and a photocatalyst antibacterial technology to prepare sol, the non-woven fabric is soaked in the sol, dried at 100 ℃, flattened and rolled to obtain the antibacterial and antiviral non-woven fabric. The technology adopts a soaking treatment mode to realize the antibacterial and antiviral performance of the spun-bonded non-woven fabric layer with a supporting function, and the antibacterial agent and the non-woven fabric layer are not firmly combined and are easy to fall off.

CN202010279585.0 discloses a preparation method of a hydrophobic sterilization mask, wherein a raw material a is obtained by blending sterilization units and hydrophobic units of quaternary ammonium salt, quaternary phosphonium salt, guanidino and biguanide base salt; melting and blending polypropylene (PP), polyester fiber, polyamide fiber, carbon fiber, glass fiber and the like to obtain a raw material b, respectively carrying out melt spinning through A, B two nozzles to prepare a multilayer composite fiber net, and carrying out hot rolling reinforcement treatment to obtain the melt-blown cloth which has the functions of isolating dust, spray and germs and can kill microorganisms adsorbed on the mask. The technology realizes the sterilization performance of the two raw materials on the melt-blown non-woven fabric layer in a melt extrusion mode, and compared with direct blending melt extrusion, the technology has the advantages of low production efficiency, high cost and no contribution to application and popularization.

In summary, the antibacterial and antiviral filter layer used for manufacturing the mask in the prior art mainly has the following two problems: the antibacterial agent is loaded on the spun-bonded non-woven fabric layer in a soaking, spraying and other modes, the spun-bonded non-woven fabric mainly plays a supporting role and has no great effect on blocking bacteria and viruses, the bacteria and the viruses can easily penetrate through the spun-bonded non-woven fabric, and the antibacterial agent and the non-woven fabric are not firmly combined, so that the alleged antibacterial and antiviral effects are difficult to realize; and (II) simultaneously performing double spray heads in the melt-blowing process, and performing melt spinning through A, B nozzles to prepare a multilayer composite fiber web for hot rolling reinforcement treatment to obtain the melt-blown fabric with antibacterial and antiviral functions.

Aiming at the defects in the prior art, a novel antibacterial and antiviral melt-blown fabric is urgently needed to be developed, so that the mask has a good protection effect when in use, the antibacterial unit and the melt-blown fabric are firmly combined, the production process is simple, large-scale production can be realized, and the popularization and the application are facilitated.

Disclosure of Invention

The invention aims to provide an antibacterial and antiviral melt-blown fabric and a preparation method thereof, and aims to solve the technical problems that an antibacterial and antiviral filter layer for mask production in the prior art is poor in antibacterial effect, an antibacterial unit is easy to fall off, and the preparation process is complex.

The invention provides an antibacterial and antiviral melt-blown fabric which is prepared from the following raw materials in parts by weight: the composition is characterized by comprising the following raw materials in parts by weight: 100 parts of polypropylene particles with the melt index of 1500, 1-5 parts of electret master batches, 0.03-10 parts of antibacterial and antiviral agents, 0.1-2 parts of lubricating agents, 0.2-2 parts of dispersing agents and 0.1-0.2 part of heat stabilizers.

Preferably, the antibacterial and antiviral agent is one or more of polymer quaternary ammonium salt, silver-loaded zirconium phosphate, silicate silver-loaded, nano silver, nano copper oxide and nano zinc oxide.

Preferably, the polymer quaternary ammonium salt is any one of chitosan quaternary ammonium salt, organosilicon quaternary ammonium salt, pyridine quaternary ammonium salt, benzimidazole quaternary ammonium salt, polystyrene quaternary ammonium salt and polyethyleneimine quaternary ammonium salt.

Preferably, the lubricant is one or more of ethylene bis stearamide, erucamide, oleamide, calcium stearate, ethylene bis oleamide, stearic acid.

Preferably, the dispersant is one or more of white oil, silicone oil, cellulose acetate, and PE wax.

Preferably, the heat stabilizer is one or two of bis (2,2,6, 6-tetramethylpiperidyl) sebacate and 2'- (2' -hydroxy-3 '-tert-butyl-5' -methylphenyl) -5-chlorobenzotriazole.

The invention provides a preparation method of antibacterial and antiviral meltblown, which comprises the following steps:

step (1) pretreatment of the antibacterial antiviral agent: fully grinding the antibacterial and antiviral agent in a ball mill to obtain antibacterial and antiviral agent powder with the particle size of less than 10 μm, wherein the grinding time is 10 min;

mixing raw materials in the step (2): accurately weighing the raw materials according to the weight part ratio, adding polypropylene particles with the melt index of 1500 into a stirrer, sequentially adding the antibacterial and antiviral powder obtained in the step (1), a lubricant, a dispersant, a heat stabilizer and electret master batches into the stirrer, and after the materials are added, mixing and stirring to obtain a mixture A, wherein the stirring time is 5 min;

melt-blowing: conveying the mixture A obtained in the step (2) to a feeding mechanism of a melt-blowing machine, conveying the mixture A to the interior of a main machine of the melt-blowing machine by the feeding mechanism, conveying the mixture A to a heating and melting area by the main machine of the melt-blowing machine through rotation, wherein the heating and melting area comprises five areas with different temperatures, the temperatures of the five areas are sequentially increased, and the mixture A is melted into fluid after passing through the heating and melting area;

conveying fluid into a melt-blowing die head through a melt pump, sequentially opening an air suction device, a hot air system and a receiving mesh belt mechanism, ejecting the fluid from micropores by the melt-blowing die head to form fibers, bringing the fibers onto the receiving mesh belt mechanism by hot air blown out from the hot air system, and molding the fibers, wherein in the molding process, the air suction device sucks away the hot air to firmly fix the fibers on the receiving mesh belt mechanism so as to form melt-blown cloth;

opening the winding mechanism and the electrostatic electret, collecting the melt-blown fabric into a coil, and adopting a corona discharge mode to make the melt-blown fabric tape be electrostatic, and finally preparing a melt-blown fabric finished product;

and (4) testing physical properties: and (4) detecting the appearance, smell, width, gram weight, stretching efficiency, filtering efficiency and other performances of the melt-blown fabric finished product prepared in the step (3) to remove defective products.

Preferably, in the step (3), the temperatures of the five regions are 160-175 ℃ in the first region, 176-197 ℃ in the second region, 200-215 ℃ in the third region, 217-225 ℃ in the fourth region, 226-235 ℃ in the fifth region, and 250 ℃ both for the flange and the neck in the main machine.

Preferably, in the step (3), the temperature of the melt pump is 248 ℃, the temperature inside the melt-blowing die head is 258 ℃, the temperature of the head of the melt-blowing die head is 235 ℃, the temperature of the connecting piece is 245 ℃, and the temperature of the heating bubble in the hot air system is 245 ℃; the rotating speed of a host machine of the melt blowing machine is 270 plus 280r/min, the rotating speed of a melt pump is 260 plus 275r/min, the pressure of hot air blown out by a hot air system is 38.0-38.5Mpa, the distance between a receiving mesh belt mechanism and micropores of a melt blowing die head is 5.2-12.5cm, the frequency of an air suction fan in an air suction device is 43-45Hz, the frequency of the receiving mesh belt mechanism is 15Hz, the winding frequency of a winding mechanism is 26.5-26.8Hz, and the voltage of an electrostatic electret is 50-60 KV.

The invention also provides a preparation method of the antibacterial and antiviral meltblown, which comprises the following steps:

step (1) pretreatment of the antibacterial antiviral agent: fully grinding the antibacterial and antiviral agent in a ball mill to obtain powder with the particle size of less than 10 microns, wherein the grinding time is 10 min;

mixing raw materials in the step (2): accurately weighing the raw materials according to the weight part ratio, adding polypropylene particles with the melt index of 1500 into a stirrer, sequentially adding the antibacterial and antiviral agent powder, the lubricant, the dispersant, the heat stabilizer and the electret master batch obtained in the step (1) into the stirrer, mixing and stirring after the materials are added to obtain a mixture A, wherein the stirring time is 5 min;

granulating in step (3): granulating the mixture A, wherein a heating melting area of a granulator is provided with six areas with different temperatures, the temperatures of the six areas are sequentially increased, namely 160 ℃ in the first area, 165 ℃ in the second area, 170 ℃ in the third area, 175 ℃ in the fourth area, 180 ℃ in the fifth area and 180 ℃ in the sixth area, the head temperature of the granulator is 175 ℃, and the rotating speed of a main engine of the granulator is 136 r/min;

melt-blowing: conveying the particulate matters obtained in the step (3) to a feeding mechanism of a melt-blowing machine, conveying the mixture A to the interior of a main machine of the melt-blowing machine by the feeding mechanism, conveying the particulate matters to a heating and melting region by the main machine of the melt-blowing machine through rotation, wherein the heating and melting region comprises five regions with different temperatures, the temperatures of the five regions are sequentially increased, the temperatures of the five regions are sequentially 165 ℃ in a first region, 178 ℃ in a second region, 208 ℃ in a third region, 220 ℃ in a fourth region and 226 ℃ in a fifth region, the temperatures of a flange and a machine neck in the main machine of the melt-blowing machine are both 250 ℃, and;

conveying fluid into a melt-blowing die head through a melt pump, sequentially opening an air suction device, a hot air system and a receiving mesh belt mechanism, ejecting the fluid from micropores by the melt-blowing die head to form fibers, bringing the fibers onto the receiving mesh belt mechanism by hot air blown out from the hot air system, and molding the fibers, wherein in the molding process, the air suction device sucks away the hot air to firmly fix the fibers on the receiving mesh belt mechanism so as to form melt-blown cloth; the temperature of a melt pump is 248 ℃, the temperature inside a melt-blowing die head is 258 ℃, the temperature of a machine head of the melt-blowing die head is 235 ℃, the temperature of a connecting piece is 245 ℃, and the temperature of heating bubbles in a hot air system is 245 ℃; the rotating speed of the host machine of the melt blowing machine is 272r/min, the rotating speed of the melt pump is 260r/min, the pressure of hot air blown out by a hot air system is 38.5Mpa, the distance between the receiving mesh belt mechanism and the micropores of the melt blowing die head is 5.2cm, the frequency of an air suction fan in the air suction device is 44Hz, and the frequency of the receiving mesh belt mechanism is 15 Hz;

performing water electret on the prepared melt-blown fabric by using water electret equipment, wherein the unreeling frequency of the water electret equipment is 31.35Hz, the reeling frequency of the water electret equipment is 31.82Hz, the pressure of a water spray head is 2MPa, drying the melt-blown fabric by using a drying device, wherein the drying device is divided into four regions with sequentially decreasing temperatures, namely a first region 165 ℃, a second region 172 ℃, a third region 157 ℃ and a fourth region 142 ℃;

and (5) testing physical properties: and (4) detecting the appearance, smell, width, gram weight, stretching efficiency, filtering efficiency and other performances of the finished melt-blown fabric prepared in the step (4) to remove defective products.

The invention has the beneficial effects that: (1) the processing aids of the lubricant, the dispersant and the heat stabilizer are added to form a curing system, so that the thermal stability and the dispersibility of the antibacterial and antiviral agent are remarkably improved, the antibacterial and antiviral agent is prevented or reduced from being degraded or crosslinked due to heating in the melt-blowing process, the physicochemical properties of the antibacterial and antiviral agent are guaranteed not to be changed in the melt-blowing process, the antibacterial and antiviral agent can be firmly combined with a polypropylene base material, the antibacterial and antiviral agent cannot easily fall off in the processing and using process, the antibacterial and antiviral agent has excellent antibacterial and antiviral effects and high biological safety performance, and the preparation process of direct melt-blowing molding is adopted, and each raw material is subjected to one-step melt extrusion processing molding in a blending mode, so that complicated post-processing steps are not needed, the operation process is simplified, the production cost is reduced, the production efficiency is improved; (2) compared with the antibacterial property of micromolecular quaternary ammonium salts commonly adopted in the prior art, the organic macromolecular polymers can be firmly combined with the polypropylene base material and cannot easily fall off, so that the prepared melt-blown fabric has excellent antibacterial and antiviral effects and high biological safety performance.

Detailed Description

The following examples are given for the detailed implementation and specific operation of the present invention, but the scope of the present invention is not limited to the following examples.

The electret master batch can increase the density and depth of a charge trapping energy trap in the melt-blown cloth, effectively release negative ions and store charges, achieve the performance of improving the comprehensive filtering effect and the thermal attenuation resistance of the melt-blown cloth, reduce the resistance of the melt-blown cloth under the condition of the same fiber fineness and gram weight, and improve the filtering effect of the melt-blown cloth at the same time.

Preferably, the polymer quaternary ammonium salt is any one of chitosan quaternary ammonium salt, organosilicon quaternary ammonium salt, pyridine quaternary ammonium salt, benzimidazole quaternary ammonium salt, polystyrene quaternary ammonium salt and polyethyleneimine quaternary ammonium salt. The quaternary ammonium salt of chitosan, quaternary ammonium salt of organosilicon, quaternary ammonium salt of pyridine, quaternary ammonium salt of benzimidazole, quaternary ammonium salt of polystyrene, quaternary ammonium salt of polyethylene imine are used as quaternary ammonium salts of organic high molecular polymer, can be combined with polypropylene base material firmly, can not drop off easily, and make the prepared melt-blown cloth have excellent antibacterial and antiviral effects and very high biological safety performance.

Preferably, the lubricant is one or more of ethylene bis stearamide, erucamide, oleamide, calcium stearate, ethylene bis oleamide, stearic acid. The lubricant can play a role in lubricating polypropylene and preventing adhesion at low temperature, reduces intramolecular friction, reduces the friction force between each raw material and processing equipment, is favorable for relative sliding between the raw materials and the processing equipment, and is convenient for demolding.

Preferably, the dispersant is one or more of white oil, silicone oil, cellulose acetate, and PE wax. The dispersant can disperse the antibacterial and antiviral agent in the melt-blown cloth uniformly, so as to ensure the long-acting antibacterial and antiviral effect.

Preferably, the heat stabilizer is one or two of bis (2,2,6, 6-tetramethylpiperidyl) sebacate and 2'- (2' -hydroxy-3 '-tert-butyl-5' -methylphenyl) -5-chlorobenzotriazole. The heat stabilizer can prevent or reduce the degradation or crosslinking of the antibacterial and antiviral agent when being heated in the melt-blowing process, ensure that the physical and chemical properties of the antibacterial and antiviral agent are not changed in the melt-blowing process, and improve the antibacterial and antiviral effect.

step (1) pretreatment of the antibacterial antiviral agent: putting the antibacterial and antiviral agent into a ball mill for full grinding to obtain antibacterial and antiviral agent powder with the particle size of less than 10 μm, grinding the antibacterial and antiviral agent into fine powder for facilitating dispersion, wherein the grinding time is 10 min; if the antibacterial agent is selected from silver-loaded zirconium phosphate, silicate-loaded silver, nano copper oxide and nano zinc oxide, the step (1) can be omitted because the sizes of the antibacterial agent per se reach the nano level;

melt-blowing: the melt-blowing machine is used for making polypropylene particles into melt-blown cloth and mainly comprises a feeding mechanism, a main machine, a melt pump, a melt-blowing die head, a receiving mesh belt mechanism, a winding mechanism, an electrostatic electret, a hot air system and an air suction device; the feeding mechanism is mainly used for containing raw materials; the main machine conveys the raw materials to a heating melting area through rotation, and the heating melting area is mainly responsible for slowly heating the raw materials to a required temperature; the melt pump is used for pumping fluid into the interior of the melt-blowing die head; the end part of the melt-blown die head is provided with micropores, and fluid is sprayed out from the micropores to form fibers; the electrostatic electret is a dielectric material with a long-term charge storage function and can enable the melt-blown cloth belt to be electrostatic; conveying the mixture A obtained in the step (2) to a feeding mechanism of a melt-blowing machine, conveying the mixture A to the interior of a main machine of the melt-blowing machine by the feeding mechanism, conveying the mixture A to a heating and melting area by the main machine of the melt-blowing machine through rotation, wherein the heating and melting area comprises five areas with different temperatures, the temperatures of the five areas are sequentially increased, and the mixture A is melted into fluid after passing through the heating and melting area;

opening the winding mechanism and the electrostatic electret, collecting the melt-blown cloth into a coil, and adopting a corona discharge mode to enable the melt-blown cloth tape to be electrostatic, so as to finally prepare a melt-blown cloth finished product, wherein electrostatic attraction can capture droplets containing bacteria and viruses, and the effect of filtering the bacteria and the viruses is achieved;

and (4) testing physical properties: detecting the appearance, smell, width, gram weight, stretching efficiency, filtering efficiency and other performances of the melt-blown fabric finished product prepared in the step (3) to remove defective products;

Preferably, in the step (3), the temperature of the melt pump is 248 ℃, the temperature inside the melt-blowing die head is 258 ℃, the temperature of the head of the melt-blowing die head is 235 ℃, the temperature of the connecting piece is 245 ℃, and the temperature of the heating bubble in the hot air system is 245 ℃; in the step (3), the rotating speed of the host machine of the melt blowing machine is 270-280r/min, the rotating speed of the melt pump is 260-275r/min, the pressure of hot air blown out by the hot air system is 38.0-38.5Mpa, the distance between the receiving mesh belt mechanism and the micropores of the melt blowing die head is 5.2-12.5cm, the frequency of an air suction fan in the air suction device is 43-45Hz, the frequency of the receiving mesh belt mechanism is 15Hz, the winding frequency of the winding mechanism is 26.5-26.8Hz, and the voltage of the electrostatic electret is 50-60 KV.

granulating in step (3): the granulator is responsible for manufacturing various mixed granules into a granule and mainly comprises a feeding mechanism, a main machine, a machine head, a cooling device and a slitting device; the feeding mechanism is responsible for feeding the mixed granules into the main machine; the main machine is responsible for heating and extruding the mixed granules, and is divided into six areas with sequentially increased temperature, and the main machine is mainly used for heating the granules to form fluid; the machine head is used for extruding the fluid to form plastic wires with uniform thickness; the cooling device is mainly used for rapidly cooling the plastic wires, generally water cooling; the cutting device is used for cutting the formed plastic wires into granules; granulating the mixture A; the heating melting area of the granulator is provided with six areas with different temperatures, the temperatures of the six areas are sequentially increased, namely 160 ℃ in the first area, 165 ℃ in the second area, 170 ℃ in the third area, 175 ℃ in the fourth area, 180 ℃ in the fifth area and 180 ℃ in the sixth area, the head temperature of the granulator is 175 ℃, and the rotating speed of a main engine of the granulator is 136 r/min;

performing water electret on the prepared melt-blown fabric by using water electret equipment, wherein the water electret equipment is responsible for enabling the melt-blown fabric to be charged with static electricity in a water electret mode; the water electret equipment comprises a water spray head, a winding mechanism, an unwinding mechanism and a drying device; the water spray head sprays water onto the melt-blown cloth from the spray head under a certain pressure, so that the melt-blown cloth is electrified by friction with the water; the winding mechanism and the unwinding mechanism are responsible for unwinding the melt-blown fabric, and then collecting the melt-blown fabric into a coil after electret;

the drying device is responsible for drying the wet melt-blown fabric after the water electret; the unreeling frequency of the unreeling mechanism is 31.35Hz, the reeling frequency of the reeling mechanism is 31.82Hz, the pressure of the water spray head is 2MPa, the melt-blown cloth is dried by a drying device, and the drying device is divided into four areas with sequentially decreasing temperatures, namely a first area 165 ℃, a second area 172 ℃, a third area 157 ℃ and a fourth area 142 ℃;

Example 1

An antibacterial and antiviral melt-blown fabric is composed of the following raw materials in parts by weight: 100 parts of polypropylene particles with the melt index of 1500, 1 part of electret master batch, 0.03 part of high molecular quaternary ammonium salt, 0.1 part of oleamide, 0.2 part of silicone oil and 0.1 part of bis (2,2,6, 6-tetramethyl piperidyl) sebacate.

The preparation method comprises the following steps: step (1) pretreatment of the antibacterial antiviral agent: putting the high molecular quaternary ammonium salt into a ball mill for full grinding to obtain powder with the particle size of less than 10 mu m, wherein the grinding time is 10 min;

mixing raw materials in the step (2): accurately weighing the raw materials according to the weight part ratio, adding polypropylene particles with the melt index of 1500 into a stirrer, sequentially adding the high-molecular quaternary ammonium salt powder obtained in the step (1), oleamide, silicone oil, bis (2,2,6, 6-tetramethyl piperidyl) sebacate and electret master batches into the stirrer, and mixing and stirring to obtain a mixture A for 5min after the materials are added;

melt-blowing: conveying the mixture A obtained in the step (2) to a feeding mechanism of a melt-blowing machine, conveying the mixture A to the interior of a main machine by the feeding mechanism, conveying the mixture A to a heating and melting area by the main machine through rotation, wherein the heating and melting area comprises five areas with different temperatures, the temperatures of the five areas are sequentially increased, the temperatures of the five areas are sequentially 165 ℃ in the first area, 178 ℃ in the second area, 208 ℃ in the third area, 220 ℃ in the fourth area and 226 ℃ in the fifth area, the temperatures of a flange and a machine neck in the main machine are both 250 ℃, and the mixture A is melted into fluid after passing through the heating and melting area;

conveying fluid into a melt-blowing die head through a melt pump, sequentially opening an air suction device, a hot air system and a receiving mesh belt mechanism, ejecting the fluid from micropores by the melt-blowing die head to form fibers, bringing the fibers onto the receiving mesh belt mechanism by hot air blown out from the hot air system, and molding the fibers, wherein in the molding process, the air suction device sucks away the hot air to firmly fix the fibers on the receiving mesh belt mechanism so as to form melt-blown cloth; the temperature of a melt pump is 248 ℃, the temperature inside a melt-blowing die head is 258 ℃, the temperature of a machine head of the melt-blowing die head is 235 ℃, the temperature of a connecting piece is 245 ℃, and the temperature of heating bubbles in a hot air system is 245 ℃; the rotating speed of the host is 272r/min, the rotating speed of the melt pump is 260r/min, the pressure of hot air blown out by a hot air system is 38.5Mpa, the distance between the receiving mesh belt mechanism and the micropores of the melt-blown die head is 5.2cm, the frequency of an air suction fan in the air suction device is 44Hz, and the frequency of the receiving mesh belt mechanism is 15 Hz;

opening the winding mechanism and the electrostatic electret, collecting the melt-blown fabric into a coil, and adopting a corona discharge mode to make the melt-blown fabric tape be electrostatic, and finally preparing a melt-blown fabric finished product; the winding frequency of the winding mechanism is 26.8Hz, and the voltage of the electrostatic electret is 51 KV;

and (4) testing physical properties: detecting the appearance, smell, width, gram weight, stretching efficiency, filtering efficiency and other performances of the melt-blown fabric finished product prepared in the step (3) to remove defective products; the prepared melt-blown fabric has no crystal points, is flat and smooth, has no peculiar smell, has the width of 175mm and the gram weight of 26.2g/m²The longitudinal tensile breaking force was 8.2N, the transverse tensile breaking force was 7.5N, and the particle filtration efficiency was 96.1%.

Example 2

An antibacterial and antiviral melt-blown fabric is composed of the following raw materials in parts by weight: 100 parts of polypropylene particles with the melt index of 1500, 2 parts of electret master batch, 1 part of organosilicon quaternary ammonium salt, 0.2 part of erucamide, 0.6 part of stearic acid, 0.6 part of white oil and 0.1 part of 2'- (2' -hydroxy-3 '-tert-butyl-5' -methylphenyl) -5-chlorobenzotriazole.

The preparation method comprises the following steps: step (1) pretreatment of the antibacterial antiviral agent: fully grinding the organosilicon quaternary ammonium salt in a ball mill to obtain powder with the particle size of less than 10 mu m, wherein the grinding time is 10 min;

mixing raw materials in the step (2): accurately weighing the raw materials according to the weight part ratio, adding polypropylene particles with the melt index of 1500 into a stirrer, sequentially adding the organosilicon quaternary ammonium salt powder obtained in the step (1), erucamide, stearic acid, white oil, 2'- (2' -hydroxy-3 '-tert-butyl-5' -methylphenyl) -5-chlorobenzotriazole and electret master batch into the stirrer, and mixing and stirring to obtain a mixture A for 5min after the materials are added;

melt-blowing: conveying the mixture A obtained in the step (2) to a feeding mechanism of a melt-blowing machine, conveying the mixture A to the interior of a main machine by the feeding mechanism, conveying the mixture A to a heating and melting area by the main machine through rotation, wherein the heating and melting area comprises five areas with different temperatures, the temperatures of the five areas are sequentially increased, the temperatures of the five areas are sequentially 170 ℃, 185 ℃, 205 ℃, 220 ℃ and 228 ℃, the temperatures of a flange and a machine neck in the main machine are 250 ℃, and the mixture A is melted into fluid after passing through the heating and melting area;

conveying fluid into a melt-blowing die head through a melt pump, sequentially opening an air suction device, a hot air system and a receiving mesh belt mechanism, ejecting the fluid from micropores by the melt-blowing die head to form fibers, bringing the fibers onto the receiving mesh belt mechanism by hot air blown out from the hot air system, and molding the fibers, wherein in the molding process, the air suction device sucks away the hot air to firmly fix the fibers on the receiving mesh belt mechanism so as to form melt-blown cloth; the temperature of a melt pump is 248 ℃, the temperature inside a melt-blowing die head is 258 ℃, the temperature of a machine head of the melt-blowing die head is 235 ℃, the temperature of a connecting piece is 245 ℃, and the temperature of heating bubbles in a hot air system is 245 ℃; the rotating speed of the host is 275r/min, the rotating speed of the melt pump is 275r/min, the pressure of hot air blown out by a hot air system is 38.0Mpa, the distance between the receiving mesh belt mechanism and the micropores of the melt-blown die head is 7.5cm, the frequency of an air suction fan in the air suction device is 43Hz, and the frequency of the receiving mesh belt mechanism is 15 Hz;

opening the winding mechanism and the electrostatic electret, collecting the melt-blown fabric into a coil, and adopting a corona discharge mode to make the melt-blown fabric tape be electrostatic, and finally preparing a melt-blown fabric finished product; the winding frequency of the winding mechanism is 26.7Hz, and the voltage of the electrostatic electret is 50 KV;

and (4) testing physical properties: detecting the appearance, smell, width, gram weight, stretching efficiency, filtering efficiency and other performances of the melt-blown fabric finished product prepared in the step (3) to remove defective products; the prepared melt-blown fabric has no crystal points, is flat and smooth, has no peculiar smell, has the width of 174mm and the gram weight of 25.2g/m²The longitudinal tensile breaking force was 7.5N, the transverse tensile breaking force was 6.9N, and the particle filtration efficiency was 94.1%.

Example 3

An antibacterial and antiviral melt-blown fabric is composed of the following raw materials in parts by weight: 100 parts of polypropylene particles with the melt index of 1500, 3 parts of electret master batch, 1 part of organosilicon quaternary ammonium salt, 1 part of chitosan quaternary ammonium salt, 0.8 part of ethylene bisoleamide, 1 part of white oil, 0.1 part of bis (2,2,6, 6-tetramethyl piperidyl) sebacate and 0.1 part of 2'- (2' -hydroxy-3 '-tert-butyl-5' -methylphenyl) -5-chlorobenzotriazole.

The preparation method comprises the following steps: step (1) pretreatment of the antibacterial antiviral agent: fully grinding organosilicon quaternary ammonium salt and chitosan quaternary ammonium salt in a ball mill to obtain powder with the particle size of less than 10 mu m, wherein the grinding time is 10 min;

mixing raw materials in the step (2): accurately weighing the raw materials according to the weight part ratio, adding polypropylene particles with the melt index of 1500 into a stirrer, sequentially adding the powder obtained in the step (1), ethylene bisoleamide, white oil, bis (2,2,6, 6-tetramethylpiperidyl) sebacate, 2'- (2' -hydroxy-3 '-tert-butyl-5' -methylphenyl) -5-chlorobenzotriazole and electret master batch into the stirrer, and mixing and stirring to obtain a mixture A for 5min after the materials are added;

melt-blowing: conveying the mixture A obtained in the step (2) to a feeding mechanism of a melt-blowing machine, conveying the mixture A to the interior of a main machine by the feeding mechanism, conveying the mixture A to a heating and melting area by the main machine through rotation, wherein the heating and melting area comprises five areas with different temperatures, the temperatures of the five areas are sequentially increased, the temperatures of the five areas are sequentially 175 ℃, 185 ℃, 215 ℃, 225 ℃ and 228 ℃, the temperatures of a flange and a machine neck in the main machine are 250 ℃, and the mixture A is melted into fluid after passing through the heating and melting area;

conveying fluid into a melt-blowing die head through a melt pump, sequentially opening an air suction device, a hot air system and a receiving mesh belt mechanism, ejecting the fluid from micropores by the melt-blowing die head to form fibers, bringing the fibers onto the receiving mesh belt mechanism by hot air blown out from the hot air system, and molding the fibers, wherein in the molding process, the air suction device sucks away the hot air to firmly fix the fibers on the receiving mesh belt mechanism so as to form melt-blown cloth; the temperature of a melt pump is 248 ℃, the temperature inside a melt-blowing die head is 258 ℃, the temperature of a machine head of the melt-blowing die head is 235 ℃, the temperature of a connecting piece is 245 ℃, and the temperature of heating bubbles in a hot air system is 245 ℃; the rotating speed of the host is 280r/min, the rotating speed of the melt pump is 270r/min, the pressure of hot air blown out by a hot air system is 38.0Mpa, the distance between the receiving mesh belt mechanism and the micropores of the melt-blown die head is 8.5cm, the frequency of an air suction fan in the air suction device is 44Hz, and the frequency of the receiving mesh belt mechanism is 15 Hz;

opening the winding mechanism and the electrostatic electret, collecting the melt-blown fabric into a coil, and adopting a corona discharge mode to make the melt-blown fabric tape be electrostatic, and finally preparing a melt-blown fabric finished product; the winding frequency of the winding mechanism is 26.8Hz, and the voltage of the electrostatic electret is 60 KV;

and (4) testing physical properties: detecting the appearance, smell, width, gram weight, stretching efficiency, filtering efficiency and other performances of the melt-blown fabric finished product prepared in the step (3) to remove defective products; the prepared melt-blown fabric has no crystal points, is flat and smooth, has no peculiar smell, has the width of 176mm and the gram weight of 24.3g/m²Longitudinal tensile breaking force 7.6N, transverse tensile breaking force 6.5N, and particle filtration efficiency 93.2%.

Example 4

An antibacterial and antiviral melt-blown fabric is composed of the following raw materials in parts by weight: 100 parts of polypropylene particles with the melt index of 1500, 4 parts of electret master batch, 3 parts of organic silicon quaternary ammonium salt, 1.3 parts of erucamide, 1.5 parts of silicone oil and 0.1 part of bis (2,2,6, 6-tetramethyl piperidyl) sebacate.

mixing raw materials in the step (2): accurately weighing the raw materials according to the weight part ratio, adding polypropylene particles with the melt index of 1500 into a stirrer, sequentially adding the powder obtained in the step (1), erucamide, silicone oil, bis (2,2,6, 6-tetramethylpiperidyl) sebacate and electret master batch into the stirrer, and after the materials are added, mixing and stirring to obtain a mixture A for 5 min;

melt-blowing: conveying the mixture A obtained in the step (2) to a feeding mechanism of a melt-blowing machine, conveying the mixture A to the interior of a main machine by the feeding mechanism, conveying the mixture A to a heating and melting area by the main machine through rotation, wherein the heating and melting area comprises five areas with different temperatures, the temperatures of the five areas are sequentially increased, the temperatures of the five areas are sequentially 166 ℃ in the first area, 185 ℃ in the second area, 215 ℃ in the third area, 225 ℃ in the fourth area and 230 ℃ in the fifth area, the temperatures of a flange and a machine neck in the main machine are both 250 ℃, and the mixture A is melted into fluid after passing through the heating and melting area;

conveying fluid into a melt-blowing die head through a melt pump, sequentially opening an air suction device, a hot air system and a receiving mesh belt mechanism, ejecting the fluid from micropores by the melt-blowing die head to form fibers, bringing the fibers onto the receiving mesh belt mechanism by hot air blown out from the hot air system, and molding the fibers, wherein in the molding process, the air suction device sucks away the hot air to firmly fix the fibers on the receiving mesh belt mechanism so as to form melt-blown cloth; the temperature of a melt pump is 248 ℃, the temperature inside a melt-blowing die head is 258 ℃, the temperature of a machine head of the melt-blowing die head is 235 ℃, the temperature of a connecting piece is 245 ℃, and the temperature of heating bubbles in a hot air system is 245 ℃; the rotating speed of the host is 270r/min, the rotating speed of the melt pump is 260r/min, the pressure of hot air blown out by a hot air system is 38.5Mpa, the distance between the receiving mesh belt mechanism and the micropores of the melt-blown die head is 12.5cm, the frequency of an air suction fan in the air suction device is 44Hz, and the frequency of the receiving mesh belt mechanism is 15 Hz;

opening the winding mechanism and the electrostatic electret, collecting the melt-blown fabric into a coil, and adopting a corona discharge mode to make the melt-blown fabric tape be electrostatic, and finally preparing a melt-blown fabric finished product; the winding frequency of the winding mechanism is 26.5Hz, and the voltage of the electrostatic electret is 52 KV;

and (4) testing physical properties: detecting the appearance, smell, width, gram weight, stretching efficiency, filtering efficiency and other performances of the melt-blown fabric finished product prepared in the step (3) to remove defective products; the prepared melt-blown fabric has no crystal points, is flat and smooth, has no peculiar smell, has the width of 174mm and the gram weight of 25.2g/m²The longitudinal tensile breaking force was 6.2N, the transverse tensile breaking force was 5.5N, and the particle filtration efficiency was 90.2%.

Example 5

An antibacterial and antiviral melt-blown fabric is composed of the following raw materials in parts by weight: 100 parts of polypropylene particles with the melt index of 1500, 5 parts of electret master batch, 5 parts of chitosan quaternary ammonium salt, 1.5 parts of oleamide, 0.9 part of white oil and 0.1 part of bis (2,2,6, 6-tetramethyl piperidyl) sebacate.

The preparation method comprises the following steps: step (1) pretreatment of the antibacterial antiviral agent: putting the chitosan quaternary ammonium salt into a ball mill for full grinding to obtain powder with the particle size of less than 10 mu m, wherein the grinding time is 10 min;

mixing raw materials in the step (2): accurately weighing the raw materials according to the weight part ratio, adding polypropylene particles with the melt index of 1500 into a stirrer, sequentially adding the powder obtained in the step (1), oleamide, white oil, bis (2,2,6, 6-tetramethylpiperidyl) sebacate and electret master batches into the stirrer, and mixing and stirring to obtain a mixture A for 5min after the materials are added;

and (4) testing physical properties: detecting the appearance, smell, width, gram weight, stretching efficiency, filtering efficiency and other performances of the melt-blown fabric finished product prepared in the step (3) to remove defective products; the prepared melt-blown fabric has no crystal points, is flat and smooth, has no peculiar smell, has the width of 175mm and the gram weight of 26.2g/m²The longitudinal tensile breaking force was 8.2N, the transverse tensile breaking force was 7.5N, and the particle filtration efficiency was 98.1%.

Example 6

An antibacterial and antiviral melt-blown fabric is composed of the following raw materials in parts by weight: 100 parts of polypropylene particles with the melt index of 1500, 4 parts of electret master batch, 6 parts of nano copper oxide with the particle diameter of 20nm-200nm, 2 parts of ethylene bis stearamide, 2 parts of cellulose acetate and 0.15 part of bis (2,2,6, 6-tetramethyl piperidyl) sebacate.

The preparation method comprises the following steps: mixing raw materials in the step (1): accurately weighing the raw materials according to the weight part ratio, adding polypropylene particles with the melt index of 1500 into a stirrer, sequentially adding nano copper oxide, ethylene bis stearamide, cellulose acetate, bis (2,2,6, 6-tetramethyl piperidyl) sebacate and electret master batches into the stirrer, and mixing and stirring to obtain a mixture A after the materials are added for 5 min;

step (2) melt-blowing: conveying the mixture A obtained in the step (1) to a feeding mechanism of a melt-blowing machine, conveying the mixture A to the interior of a main machine by the feeding mechanism, conveying the mixture A to a heating and melting area by the main machine through rotation, wherein the heating and melting area comprises five areas with different temperatures, the temperatures of the five areas are sequentially increased, the temperatures of the five areas are sequentially 160 ℃, 176 ℃, 200 ℃, 217 ℃ and 235 ℃, the temperatures of a flange and a machine neck in the main machine are 250 ℃, and the mixture A is melted into fluid after passing through the heating and melting area;

and (3) testing physical properties: detecting the appearance, smell, width, gram weight, stretching efficiency, filtering efficiency and other performances of the melt-blown fabric finished product prepared in the step (2), and removing defective products; the prepared melt-blown fabric has no crystal points, is flat and smooth, has no peculiar smell, has the width of 175mm and the gram weight of 28.2g/m²The longitudinal tensile breaking force was 6.1N, the transverse tensile breaking force was 6.0N, and the particle filtration efficiency was 70.1%.

Example 7

An antibacterial and antiviral melt-blown fabric is composed of the following raw materials in parts by weight: 100 parts of polypropylene particles with the melt index of 1500, 3 parts of electret master batches, 7 parts of nano zinc oxide with the particle diameter of 20nm-200nm, 0.4 part of calcium stearate, 0.5 part of PE wax and 0.1 part of 2'- (2' -hydroxy-3 '-tert-butyl-5' -methylphenyl) -5-chlorobenzotriazole.

The preparation method comprises the following steps: mixing raw materials in the step (1): accurately weighing the raw materials according to the weight part ratio, adding polypropylene particles with the melt index of 1500 into a stirrer, sequentially adding nano zinc oxide, calcium stearate, PE wax, 2'- (2' -hydroxy-3 '-tert-butyl-5' -methylphenyl) -5-chlorobenzotriazole and electret master batch into the stirrer, and after the materials are added, mixing and stirring to obtain a mixture A, wherein the stirring time is 5 min;

step (2) melt-blowing: conveying the mixture A obtained in the step (1) to a feeding mechanism of a melt-blowing machine, conveying the mixture A to the interior of a main machine by the feeding mechanism, conveying the mixture A to a heating and melting area by the main machine through rotation, wherein the heating and melting area comprises five areas with different temperatures, the temperatures of the five areas are sequentially increased, the temperatures of the five areas are sequentially 166 ℃ in the first area, 197 ℃ in the second area, 215 ℃ in the third area, 225 ℃ in the fourth area and 230 ℃ in the fifth area, the temperatures of a flange and a machine neck in the main machine are both 250 ℃, and the mixture A is melted into fluid after passing through the heating and melting area;

and (3) testing physical properties: detecting the appearance, smell, width, gram weight, stretching efficiency, filtering efficiency and other performances of the melt-blown fabric finished product prepared in the step (2), and removing defective products; the prepared melt-blown fabric has no crystal points, is flat and smooth, has no peculiar smell, has the width of 176mm and the gram weight of 26.2g/m²The longitudinal tensile breaking force was 5.1N, the transverse tensile breaking force was 5.0N, and the particle filtration efficiency was 72.1%.

Example 8

An antibacterial and antiviral melt-blown fabric is composed of the following raw materials in parts by weight: 100 parts of polypropylene particles with the melt index of 1500, 2 parts of electret master batches, 8 parts of silver-loaded zirconium phosphate, 0.6 part of oleamide, 0.7 part of white oil and 0.1 part of 2'- (2' -hydroxy-3 '-tert-butyl-5' -methylphenyl) -5-chlorobenzotriazole.

The preparation method comprises the following steps: mixing raw materials in the step (1): accurately weighing the raw materials according to the weight part ratio, adding polypropylene particles with the melt index of 1500 into a stirrer, sequentially adding silver-loaded zirconium phosphate, oleamide, white oil, 2'- (2' -hydroxy-3 '-tert-butyl-5' -methylphenyl) -5-chlorobenzotriazole and electret master batches into the stirrer, and after the materials are added, mixing and stirring to obtain a mixture A, wherein the stirring time is 5 min;

step (2) melt-blowing: conveying the mixture A obtained in the step (1) to a feeding mechanism of a melt-blowing machine, conveying the mixture A to the interior of a main machine by the feeding mechanism, conveying the mixture A to a heating and melting area by the main machine through rotation, wherein the heating and melting area comprises five areas with different temperatures, the temperatures of the five areas are sequentially increased, the temperatures of the five areas are sequentially 166 ℃ in a first area, 185 ℃ in a second area, 215 ℃ in a third area, 225 ℃ in a fourth area and 230 ℃ in a fifth area, the temperatures of a flange and a machine neck in the main machine are both 250 ℃, and the mixture A is melted into fluid after passing through the heating and melting area;

and (3) testing physical properties: detecting the appearance, smell, width, gram weight, stretching efficiency, filtering efficiency and other performances of the melt-blown fabric finished product prepared in the step (2), and removing defective products; the prepared melt-blown fabric has no crystal points, is flat and smooth, has no peculiar smell, has the width of 176mm and the gram weight of 26.2g/m²The longitudinal tensile breaking force was 6.1N, the transverse tensile breaking force was 5.0N, and the particle filtration efficiency was 76.5%.

Example 9

An antibacterial and antiviral melt-blown fabric is composed of the following raw materials in parts by weight: 100 parts of polypropylene particles with the melt index of 1500, 1 part of electret master batch, 9 parts of silicate silver-carrying, 1.2 parts of oleamide, 1.5 parts of white oil and 0.1 part of 2'- (2' -hydroxy-3 '-tert-butyl-5' -methylphenyl) -5-chlorobenzotriazole.

The preparation method comprises the following steps: mixing raw materials in the step (1): accurately weighing the raw materials according to the weight part ratio, adding polypropylene particles with the melt index of 1500 into a stirrer, sequentially adding silicate-loaded silver, oleamide, white oil, 2'- (2' -hydroxy-3 '-tert-butyl-5' -methylphenyl) -5-chlorobenzotriazole and electret master batches into the stirrer, and mixing and stirring to obtain a mixture A for 5min after the materials are added;

and (3) testing physical properties: detecting the appearance, smell, width, gram weight, stretching efficiency, filtering efficiency and other performances of the melt-blown fabric finished product prepared in the step (2), and removing defective products; the prepared melt-blown fabric has no crystal points, is flat and smooth, has no peculiar smell, has the width of 176mm and the gram weight of 26.2g/m²The longitudinal tensile breaking force was 5.3N, the transverse tensile breaking force was 5.0N, and the particle filtration efficiency was 73.5%.

Example 10

An antibacterial and antiviral melt-blown fabric is composed of the following raw materials in parts by weight: 100 parts of polypropylene particles with the melt index of 1500, 3 parts of electret master batch, 10 parts of nano-silver, 1.2 parts of oleamide, 0.2 part of stearic acid, 1.5 parts of white oil, 0.2 part of silicone oil and 0.2 part of 2'- (2' -hydroxy-3 '-tert-butyl-5' -methylphenyl) -5-chlorobenzotriazole.

The preparation method comprises the following steps: mixing raw materials in the step (1): accurately weighing the raw materials in parts by weight, adding polypropylene particles with a melt index of 1500 into a stirrer, sequentially adding nano silver, oleamide, stearic acid, white oil, silicone oil, 2'- (2' -hydroxy-3 '-tert-butyl-5' -methylphenyl) -5-chlorobenzotriazole and electret master batches into the stirrer, and mixing and stirring to obtain a mixture A for 5min after the materials are added;

and (3) testing physical properties: detecting the appearance, smell, width, gram weight, stretching efficiency, filtering efficiency and other performances of the melt-blown fabric finished product prepared in the step (2), and removing defective products; the prepared melt-blown fabric has no crystal points, is flat and smooth, has no peculiar smell, has the width of 176mm and the gram weight of 26.2g/m²Longitudinal tensile breaking force of 5.7N, transverse tensile breaking force of 5.0N, and particle filtration efficiency of 76.0%.

Example 11

An antibacterial and antiviral melt-blown fabric is composed of the following raw materials in parts by weight: 100 parts of polypropylene particles with the melt index of 1500, 5 parts of electret master batch, 10 parts of chitosan quaternary ammonium salt, 2 parts of oleamide, 1 part of white oil and 0.2 part of bis (2,2,6, 6-tetramethyl piperidyl) sebacate.

conveying fluid into a melt-blowing die head through a melt pump, sequentially opening an air suction device, a hot air system and a receiving mesh belt mechanism, ejecting the fluid from micropores by the melt-blowing die head to form fibers, bringing the fibers onto the receiving mesh belt mechanism by hot air blown out from the hot air system, and molding the fibers, wherein in the molding process, the air suction device sucks away the hot air to firmly fix the fibers on the receiving mesh belt mechanism so as to form melt-blown cloth; the temperature of a melt pump is 248 ℃, the temperature inside a melt-blowing die head is 258 ℃, the temperature of a machine head of the melt-blowing die head is 235 ℃, the temperature of a connecting piece is 245 ℃, and the temperature of heating bubbles in a hot air system is 245 ℃; the rotating speed of the main machine is 271r/min, the rotating speed of the melt pump is 260r/min, the pressure of hot air blown out by a hot air system is 38.5Mpa, the distance between the receiving mesh belt mechanism and the micropores of the melt-blown die head is 8.5cm, the frequency of an air suction fan in the air suction device is 45Hz, and the frequency of the receiving mesh belt mechanism is 15 Hz;

opening the winding mechanism and the electrostatic electret, collecting the melt-blown fabric into a coil, and adopting a corona discharge mode to make the melt-blown fabric tape be electrostatic, and finally preparing a melt-blown fabric finished product; the winding frequency of the winding mechanism is 26.5Hz, and the voltage of the electrostatic electret is 51 KV;

and (4) testing physical properties: detecting the appearance, smell, width, gram weight, stretching efficiency, filtering efficiency and other performances of the melt-blown fabric finished product prepared in the step (3) to remove defective products; the prepared melt-blown fabric has no crystal points, is flat and smooth, has no peculiar smell, has the width of 176mm and the gram weight of 26.5g/m²The longitudinal tensile breaking force was 7.2N, the transverse tensile breaking force was 7.0N, and the particle filtration efficiency was 90.0%.

Example 12

granulating in step (3): granulating the mixture A; the heating melting area of the granulator is provided with six areas with different temperatures, the temperatures of the six areas are sequentially increased, namely 160 ℃ in the first area, 165 ℃ in the second area, 170 ℃ in the third area, 175 ℃ in the fourth area, 180 ℃ in the fifth area and 180 ℃ in the sixth area, the head temperature of the granulator is 175 ℃, and the rotating speed of a main engine of the granulator is 136 r/min;

performing water electret on the prepared melt-blown fabric by using water electret equipment, wherein the water electret equipment is responsible for enabling the melt-blown fabric to be charged with static electricity in a water electret mode; the water electret equipment comprises a water spray head, a winding mechanism, an unwinding mechanism and a drying device; the water spray head sprays water onto the melt-blown cloth from the spray head under a certain pressure, so that the melt-blown cloth is electrified by friction with the water; the winding mechanism and the unwinding mechanism are responsible for unwinding the melt-blown fabric, and then collecting the melt-blown fabric into a coil after electret; the drying device is responsible for drying the wet melt-blown fabric after the water electret; the unreeling frequency of the unreeling mechanism is 31.35Hz, the reeling frequency of the reeling mechanism is 31.82Hz, the pressure of the water spray head is 2MPa, the melt-blown cloth is dried by a drying device, and the drying device is divided into four areas with sequentially decreasing temperatures, namely a first area 165 ℃, a second area 172 ℃, a third area 157 ℃ and a fourth area 142 ℃;

and (5) testing physical properties: detecting the appearance, smell, width, gram weight, stretching efficiency, filtering efficiency and other performances of the melt-blown fabric finished product prepared in the step (4) to remove defective products; the prepared melt-blown fabric has no crystal points, is flat and smooth, has no peculiar smell, has the width of 176mm and the gram weight of 26.5g/m²The longitudinal tensile breaking force was 8.1N, the transverse tensile force was 7.5, and the particle filtration efficiency was 97.5%.

Example 13

An antibacterial and antiviral melt-blown fabric is composed of the following raw materials in parts by weight: 100 parts of polypropylene particles with the melt index of 1500, 1 part of electret master batch, 0.03 part of pyridine quaternary ammonium salt, 0.1 part of oleamide, 0.2 part of silicone oil and 0.1 part of bis (2,2,6, 6-tetramethyl piperidyl) sebacate.

The preparation method comprises the following steps: step (1) pretreatment of the antibacterial antiviral agent: putting the quaternary ammonium salt into a ball mill for full grinding to obtain powder with the particle size of less than 10 mu m, wherein the grinding time is 10 min;

mixing raw materials in the step (2): accurately weighing the raw materials according to the weight part ratio, adding polypropylene particles with the melt index of 1500 into a stirrer, sequentially adding the quaternary ammonium salt powder obtained in the step (1), oleamide, silicone oil, bis (2,2,6, 6-tetramethyl piperidyl) sebacate and electret master batches into the stirrer, and mixing and stirring to obtain a mixture A for 5min after the addition is finished;

and (4) testing physical properties: detecting the appearance, smell, width, gram weight, stretching efficiency, filtering efficiency and other performances of the melt-blown fabric finished product prepared in the step (3) to remove defective products; the prepared melt-blown fabric has no crystal points, is flat and smooth, has no peculiar smell, has the width of 176mm and the gram weight of 26.4g/m²The longitudinal tensile breaking force was 8.1N, the transverse tensile breaking force was 7.6N, and the particle filtration efficiency was 96.2%.

Example 14

An antibacterial and antiviral melt-blown fabric is composed of the following raw materials in parts by weight: 100 parts of polypropylene particles with the melt index of 1500, 2 parts of electret master batch, 1 part of benzimidazole quaternary ammonium salt, 0.2 part of erucamide, 0.6 part of stearic acid, 0.6 part of white oil and 0.1 part of 2'- (2' -hydroxy-3 '-tert-butyl-5' -methylphenyl) -5-chlorobenzotriazole.

The preparation method comprises the following steps: step (1) pretreatment of the antibacterial antiviral agent: putting the benzimidazole quaternary ammonium salt into a ball mill for full grinding to obtain powder with the particle size of less than 10 mu m, wherein the grinding time is 10 min;

mixing raw materials in the step (2): accurately weighing the raw materials according to the weight part ratio, adding polypropylene particles with the melt index of 1500 into a stirrer, sequentially adding the benzimidazole quaternary ammonium salt powder obtained in the step (1), erucamide, stearic acid, white oil, 2'- (2' -hydroxy-3 '-tert-butyl-5' -methylphenyl) -5-chlorobenzotriazole and electret master batch into the stirrer, and mixing and stirring to obtain a mixture A for 5min after the materials are added;

and (4) testing physical properties: detecting the appearance, smell, width, gram weight, stretching efficiency, filtering efficiency and other performances of the melt-blown fabric finished product prepared in the step (3) to remove defective products; the prepared melt-blown fabric has no crystal points, is flat and smooth, has no peculiar smell, has the width of 172mm and the gram weight of 25.5g/m²Longitudinal tensile breaking force of 7.0N, transverse tensile breaking force of 6.2N, and particle filtration efficiency of 93.1%.

Example 15

An antibacterial and antiviral melt-blown fabric is composed of the following raw materials in parts by weight: 100 parts of polypropylene particles with the melt index of 1500, 3 parts of electret master batch, 2 parts of polystyrene quaternary ammonium salt, 0.8 part of ethylene bisoleamide, 1 part of white oil, 0.1 part of bis (2,2,6, 6-tetramethyl piperidyl) sebacate and 0.1 part of 2'- (2' -hydroxy-3 '-tert-butyl-5' -methylphenyl) -5-chlorobenzotriazole.

The preparation method comprises the following steps: step (1) pretreatment of the antibacterial antiviral agent: fully grinding the polystyrene quaternary ammonium salt in a ball mill to obtain powder with the particle size of less than 10 mu m, wherein the grinding time is 10 min;

mixing raw materials in the step (2): accurately weighing the raw materials according to the weight part ratio, adding polypropylene particles with the melt index of 1500 into a stirrer, sequentially adding the polystyrene quaternary ammonium salt powder obtained in the step (1), ethylene bisoleamide, white oil, bis (2,2,6, 6-tetramethyl piperidyl) sebacate, 2'- (2' -hydroxy-3 '-tert-butyl-5' -methylphenyl) -5-chlorobenzotriazole and electret master batch into the stirrer, and after the materials are added, mixing and stirring to obtain a mixture A, wherein the stirring time is 5 min;

and (4) testing physical properties: detecting the appearance, smell, width, gram weight, stretching efficiency, filtering efficiency and other performances of the melt-blown fabric finished product prepared in the step (3) to remove defective products; the prepared melt-blown fabric has no crystal points, is flat and smooth, has no peculiar smell, has the width of 170mm and the gram weight of 24.8g/m²The longitudinal tensile breaking force was 7.1N, the transverse tensile breaking force was 6.2N, and the particle filtration efficiency was 91.2%.

Example 16

An antibacterial and antiviral melt-blown fabric is composed of the following raw materials in parts by weight: 100 parts of polypropylene particles with the melt index of 1500, 4 parts of electret master batch, 3 parts of polyethyleneimine quaternary ammonium salt, 1.3 parts of erucamide, 1.5 parts of silicone oil and 0.1 part of bis (2,2,6, 6-tetramethyl piperidyl) sebacate.

The preparation method comprises the following steps: step (1) pretreatment of the antibacterial antiviral agent: putting the polyethyleneimine quaternary ammonium salt into a ball mill for full grinding to obtain powder with the particle size of less than 10 microns, wherein the grinding time is 10 min;

mixing raw materials in the step (2): accurately weighing the raw materials according to the weight part ratio, adding polypropylene particles with the melt index of 1500 into a stirrer, sequentially adding the polyethyleneimine quaternary ammonium salt powder obtained in the step (1), erucamide, silicone oil, bis (2,2,6, 6-tetramethylpiperidyl) sebacate and electret master batches into the stirrer, and mixing and stirring to obtain a mixture A for 5min after the addition is finished;

and (4) testing physical properties: detecting the appearance, smell, width, gram weight, stretching efficiency, filtering efficiency and other performances of the melt-blown fabric finished product prepared in the step (3) to remove defective products; the prepared melt-blown fabric has no crystal points, is flat and smooth, has no peculiar smell, has the width of 176mm and the gram weight of 25.3g/m²The longitudinal tensile breaking force was 6.1N, the transverse tensile breaking force was 5.8N, and the particle filtration efficiency was 93.2%.

Comparative example 1

The melt-blown fabric is composed of the following raw materials in parts by weight: 100 parts of polypropylene particles with the melt index of 2000 and 1 part of electret master batch.

The preparation method comprises the following steps: mixing raw materials in the step (1): accurately weighing the raw materials according to the weight part ratio, adding the raw materials into a stirrer, and mixing and stirring the raw materials to obtain a mixture A, wherein the stirring time is 5 min;

step (2) melt-blowing: conveying the mixture A obtained in the step (1) to a feeding mechanism of a melt-blowing machine, conveying the mixture A to the interior of a main machine by the feeding mechanism, conveying the mixture A to a heating and melting area by the main machine through rotation, wherein the heating and melting area comprises five areas with different temperatures, the temperatures of the five areas are sequentially increased, the temperatures of the five areas are sequentially 165 ℃ in a first area, 178 ℃ in a second area, 208 ℃ in a third area, 220 ℃ in a fourth area and 226 ℃ in a fifth area, the temperatures of a flange and a machine neck in the main machine are both 250 ℃, and the mixture A is melted into fluid after passing through the heating and melting area;

and (3) testing physical properties: and (3) detecting the performances of appearance, smell, width, gram weight, stretching, filtering efficiency and the like of the finished melt-blown fabric prepared in the step (2), wherein the prepared melt-blown fabric has no crystal points, is flat and smooth, has no peculiar smell, has a width of 175mm and a gram weight of 25.6g/m²The longitudinal tensile breaking force was 6.3N, the transverse tensile breaking force was 5.5N, and the particle filtration efficiency was 91.1%.

Comparative example 2

The melt-blown fabric is composed of the following raw materials in parts by weight: 100 parts of polypropylene particles with the melt index of 1500 and 2 parts of electret master batch.

step (2) melt-blowing: conveying the mixture A obtained in the step (1) to a feeding mechanism of a melt-blowing machine, conveying the mixture A to the interior of a main machine by the feeding mechanism, conveying the mixture A to a heating and melting area by the main machine through rotation, wherein the heating and melting area comprises five areas with different temperatures, the temperatures of the five areas are sequentially increased, the temperatures of the five areas are sequentially 170 ℃, 185 ℃, 205 ℃, 220 ℃ and 228 ℃, the temperatures of a flange and a machine neck in the main machine are 250 ℃, and the mixture A is melted into fluid after passing through the heating and melting area;

and (3) testing physical properties: detecting the appearance, smell, width, gram weight, stretching efficiency, filtering efficiency and other performances of the finished melt-blown fabric prepared in the step (2), wherein the prepared melt-blown fabric has no crystal points and is flat in appearanceSmooth, no peculiar smell, wide width of 175mm, and gram weight of 25.8g/m²The longitudinal tensile breaking force was 8.3N, the transverse tensile breaking force was 7.5N, and the particle filtration efficiency was 95.8%.

Comparative example 3

The melt-blown fabric is composed of the following raw materials in parts by weight: 100 parts of polypropylene particles with the melt index of 1500 and 1 part of electret master batch.

granulating in step (2): granulating the mixture A; the heating melting area of the granulator is provided with six areas with different temperatures, the temperatures of the six areas are sequentially increased, namely 160 ℃ in the first area, 165 ℃ in the second area, 170 ℃ in the third area, 175 ℃ in the fourth area, 180 ℃ in the fifth area and 180 ℃ in the sixth area, the head temperature of the granulator is 175 ℃, and the rotating speed of a main engine of the granulator is 136 r/min;

melt-blowing: conveying the particulate matters obtained in the step (2) to a feeding mechanism of a melt-blowing machine, conveying the mixture A to the interior of a main machine of the melt-blowing machine by the feeding mechanism, conveying the particulate matters to a heating and melting region by the main machine of the melt-blowing machine through rotation, wherein the heating and melting region comprises five regions with different temperatures, the temperatures of the five regions are sequentially increased, the temperatures of the five regions are sequentially 165 ℃ in a first region, 178 ℃ in a second region, 208 ℃ in a third region, 220 ℃ in a fourth region and 226 ℃ in a fifth region, the temperatures of a flange and a machine neck in the main machine of the melt-blowing machine are both 250 ℃, and;

performing water electret on the prepared melt-blown fabric by using water electret equipment, wherein the unreeling frequency of an unreeling mechanism of the water electret equipment is 31.35Hz, the reeling frequency of a reeling mechanism of the water electret equipment is 31.82Hz, the pressure of a water spray head is 2MPa, and drying the melt-blown fabric by using a drying device, wherein the drying device is divided into four regions with sequentially decreasing temperatures, namely a first region 165 ℃, a second region 172 ℃, a third region 157 ℃ and a fourth region 142 ℃;

and (4) testing physical properties: detecting the appearance, smell, width, gram weight, stretching efficiency, filtering efficiency and other performances of the melt-blown fabric finished product prepared in the step (3) to remove defective products; the prepared melt-blown fabric has no crystal points, is flat and smooth, has no peculiar smell, has the width of 176mm and the gram weight of 26.5g/m²The longitudinal tensile breaking force is 8.1N, the transverse tensile force is 7.5, and the particle filtration efficiency is 99.8%.

Biological Performance testing

The meltblown fabrics obtained in examples 1 to 12 and comparative examples 1 to 3 were subjected to the following performance tests, respectively:

(1) and (3) antibacterial testing:

reference is made to GB/T20944.3 evaluation of antibacterial properties of textiles section 3: the test was carried out by the oscillatory method.

(2) Antiviral testing:

with reference to ISO 18184: 2014(E) test method for testing antiviral property of textiles.

(3) Cytotoxicity test:

reference is made to GB/T16886.5-2017 section 5 of biological evaluation of medical devices: in vitro cytotoxicity assay.

The test results are shown in table 1.

TABLE 1

As can be seen from Table 1, the meltblown provided by the present invention has excellent antibacterial and antiviral properties, while the biosafety is also ensured.

What has been described above are merely some embodiments of the present invention. It will be apparent to those skilled in the art that various changes and modifications can be made without departing from the inventive concept thereof, and these changes and modifications can be made without departing from the spirit and scope of the invention.

Claims

1. An antibacterial and antiviral meltblown fabric, which is characterized in that: the composition is characterized by comprising the following raw materials in parts by weight: 100 parts of polypropylene particles with the melt index of 1500, 1-5 parts of electret master batches, 0.03-10 parts of antibacterial and antiviral agents, 0.1-2 parts of lubricating agents, 0.2-2 parts of dispersing agents and 0.1-0.2 part of heat stabilizers.

2. The antibacterial and antiviral meltblown fabric according to claim 1, wherein: the antibacterial antiviral agent is one or more of polymer quaternary ammonium salt, silver-loaded zirconium phosphate, silicate silver-loaded, nano silver, nano copper oxide and nano zinc oxide.

3. The antibacterial and antiviral meltblown fabric according to claim 2, wherein: the polymer quaternary ammonium salt is any one of chitosan quaternary ammonium salt, organosilicon quaternary ammonium salt, pyridine quaternary ammonium salt, benzimidazole quaternary ammonium salt, polystyrene quaternary ammonium salt and polyethyleneimine quaternary ammonium salt.

4. The antibacterial and antiviral meltblown fabric according to claim 1, wherein: the lubricant is one or more of ethylene bis stearamide, erucamide, oleamide, calcium stearate, ethylene bis oleamide and stearic acid.

5. The antibacterial and antiviral meltblown fabric according to claim 1, wherein: the dispersing agent is one or more of white oil, silicone oil, cellulose acetate and PE wax.

6. The antibacterial and antiviral meltblown fabric according to claim 1, wherein: the heat stabilizer is one or two of bis (2,2,6, 6-tetramethyl piperidyl) sebacate and 2'- (2' -hydroxy-3 '-tert-butyl-5' -methylphenyl) -5-chlorobenzotriazole.

7. The method of manufacturing antibacterial and antiviral meltblown fabric according to any of claims 1-6, wherein: the method comprises the following steps:

step (1) pretreatment of the antibacterial antiviral agent: fully grinding the antibacterial and antiviral agent in a ball mill to obtain antibacterial and antiviral agent powder with the particle size of less than 10um, wherein the grinding time is 10 min;

8. The method for preparing the antibacterial and antiviral meltblown fabric according to claim 7, wherein the method comprises the following steps: in the step (3), the temperature of the five regions is 160-175 ℃ in the first region, 176-197 ℃ in the second region, 200-215 ℃ in the third region, 217-225 ℃ in the fourth region, 226-235 ℃ in the fifth region, and the temperature of the flange and the machine neck in the main machine is 250 ℃.

9. The method for preparing the antibacterial and antiviral meltblown fabric according to claim 7, wherein the method comprises the following steps: in the step (3), the temperature of the melt pump is 248 ℃, the temperature inside the melt-blowing die head is 258 ℃, the temperature of the head of the melt-blowing die head is 235 ℃, the temperature of the connecting piece is 245 ℃, and the temperature of the heating bubble in the hot air system is 245 ℃; the rotating speed of a host machine of the melt blowing machine is 270 plus 280r/min, the rotating speed of a melt pump is 260 plus 275r/min, the pressure of hot air blown out by a hot air system is 38.0-38.5Mpa, the distance between a receiving mesh belt mechanism and micropores of a melt blowing die head is 5.2-12.5cm, the frequency of an air suction fan in an air suction device is 43-45Hz, the frequency of the receiving mesh belt mechanism is 15Hz, the winding frequency of a winding mechanism is 26.5-26.8Hz, and the voltage of an electrostatic electret is 50-60 KV.

10. The process for preparing an antibacterial and antiviral meltblown fabric according to any of claims 1-6, wherein: the method comprises the following steps: